Perhaps you should try some spelling variations:
"proletariado revolution" » "proletariado revolucion", "proletariado evolucion", "proletariado revoluciones"
"proletarias revolution" » "proletarias revolucion", "proletarias evolucion", "proletarias revoluciones", "proletarios revolution", "proletariat revolution", "proletario revolution"
"proletaria revolution" » "proletaria revolucion", "proletaria evolucion", "proletaria revoluciones"

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("proletariado revolution") OR ((("proletarias revolution") OR ("proletaria revolution"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"proletariado revolution\") OR (((\"proletarias revolution\") OR (\"proletaria revolution\"))))".
• Removing quotes may allow a broader search: (( proletariado revolution ) OR ((( proletarias revolution ) OR ( proletaria revolution )))).
• Adding a wildcard symbol may retrieve word variants: (("proletariado revolution") OR ((("proletarias revolution") OR ("proletaria revolution"))))*.